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. Author manuscript; available in PMC: 2016 Feb 23.
Published in final edited form as: Neuroepidemiology. 2015 Feb 17;44(1):45–50. doi: 10.1159/000371850

Table 2.

Severity of tremor in hand-drawn spirals in four ET case samples

Population-
Based Study in
Northern
Manhattan		 Study of the
Environmental
Epidemiology of
ET		 Family Study of
Essential
Tremor		 Essential
Tremor
Centralized
Brain
Repository
N 106 388 160 177
Hand-drawn spiral rating >2 in dominant arm 1 37/106 (29.9) 151/386 (39.1) 70/159 (44.0) 133/166 (80.1)
Hand-drawn spiral rating >2 in either arm1 74/106 (69.8) 195/386 (50.5) 94/156 (60.3) 147/165 (89.1)
Hand-drawn spiral rating >2 in both arms1 27/106 (25.5) 107/386 (27.7) 55/156 (35.3) 114/165 (69.1)
Hand-drawn spiral rating >1.5 in dominant arm1 NAv 2 234/386 (60.6) 128/159 (80.5) 154/166 (92.8)
Hand-drawn spiral rating >1.5 in either arm1 NAv 2 304/386 (78.8) 146/156 (93.6) 160/165 (97.0)
Hand-drawn spiral rating >1.5 in both arms1 NAv 2 199/386 (51.6) 122/156 (78.2) 147/165 (89.1)
Correlation between hand-drawn spiral rating (dominant arm) and total tremor score3 0.66, p <0.001 0.70, p<0.001 0.73, p<0.001 0.65, p<0.001
Answered “yes” to the question, “Does your hand usually tremor when you hold a pen or write your name?” 1 43/106 (40.6) 304 (78.8) 135/159 (84.9) 159/176 (90.3)

Values are proportions (percentage).

In some cases, data are missing.

1

The data in this row may be considered a measure of sensitivity of the test.

2

Tremor rating = 1.5 was not assigned in this study protocol.

3

Spearman’s correlation coefficient, p value.